LSAW (Longitudinal double submerge arc welding) carbon steel pipe is a type of SAW pipe made of steel plates that were hot rolled by JCOE or UOE forming technology. JCOE technology represents the shaping and forming processes involved during manufacturing as well as the inner and outer welding and cold expansion carried out after welding.

LSAW pipe sizes: OD 406 mm – 1620 mm, thickness 6.35 mm – 60 mm, pipe length 2 m – 18 m with the LSAW pipe having superiority.

LSAW steel pipe manufacturing process

The LSAW large diameter steel pipe manufacturing process is explained in the steps below:

1. Plate Probe: This is used for manufacturing the large diameter LSAW joints right after it enters the production line which is the initial full-board ultrasonic testing.
2. Milling: The machine used for milling does this operation through two-edged milling plate to meet the requirements of the plate width and the sides parallel to the shape and degree.
3. Pre-curved side: This side is achieved by using a pre-bending machine on the pre-bending plate edge. The plate edge needs to meet curvature requirement.
4. Forming: After the pre-bending step, in the first half of the JCO molding machine, after stamped steel, it is pressed into a “J” shape while the on the other half of the same steel plate it is bent and pressed into a “C” shape, then the final opening forms an “O” shape.
5. Pre-welding: This is to make a welded pipe steel a straight seam after it has been formed and then use gas welding seam (MAG) for continuous welding.
6. Inside weld: This is done with a tandem multi-wire submerged arc welding (about four wire) on the inner part of the straight seam welded steel pipe.
7. Outside Weld: Outside weld is the tandem multi-wire submerged arc welding on the outer part of the LSAW steel pipe welding.
8. Ultrasonic Testing: Outside and inside of the straight seam welded steel pipe and both sides of the base material are welded with 100% inspection.
9. X-ray inspection: X-ray industrial TV inspection is carried out on the inside and outside using image processing system to make sure there is detection sensitivity.
10. Expansion: This is for accomplishing submerged arc welding and straight seam steel pipe length hole diameter so as to improve the steel tube’s size precision and improve the distribution of stress in the steel tube.
11. Hydraulic test: This is carried out on the hydraulic test machine for steel after expanding by-root test for ensuring the steel pipe meets the standard requirements with the machine having an automatic recording and storage capabilities.
12. Chamfering: This involves the inspection carried out on the steel pipe at the end of the whole process.

LSAW steel pipe features

Features:

-Large diameter steel pipes
-Thick walls
-High-Pressure resistance
-Low-temperature resistance

Tests:

-Chemical Component Analysis
-Mechanical Properties – Elongation, Yield Strength, Ultimate Tensile Strength
-Technical Properties – DWT Test, Impact Test, Blow Test, Flattening Test
-X-ray Test
-Exterior Size Inspection
-Hydrostatic Test
-UT Test

Advantages of LSAW Pipes

Longitudinal Submerged Arc Welded (LSAW) pipes offer a range of advantages that make them a preferred choice in the world of steel pipelines. One key advantage lies in their high strength and durability, attributed to the longitudinal welding process that forms a robust seam along the length of the pipe. This characteristic makes LSAW pipes well-suited for applications requiring resistance to external pressures and environmental stresses. Additionally, the manufacturing process allows for the production of pipes with large diameters, making them suitable for transporting substantial volumes of fluids and gases over long distances.

LSAW pipes are also recognized for their dimensional accuracy and uniformity, ensuring a reliable and consistent performance in various industrial settings. The versatility of these pipes is evident in their adaptability to different coating and lining materials, enhancing corrosion resistance and extending their service life. Furthermore, the straight seam configuration of LSAW pipes simplifies the installation process, contributing to cost-effectiveness and efficiency in construction projects. Overall, the combination of strength, size flexibility, and ease of installation positions LSAW pipes as a reliable and efficient choice for a wide range of applications in the transportation of liquids and gases.

Applications

Longitudinal Submerged Arc Welded (LSAW) pipes find widespread applications across various industries due to their robust construction and versatile capabilities. One primary application lies in the transportation of liquids and gases, where the strength and durability of LSAW pipes are crucial for ensuring the safe and efficient movement of substances over long distances. These pipes are commonly employed in the oil and gas industry, serving as key components in the infrastructure for the transmission of crude oil, natural gas, and other hydrocarbons.

In addition to the energy sector, LSAW pipes play a vital role in the water industry, facilitating the conveyance of potable water, wastewater, and irrigation systems. Their resistance to corrosion and ability to withstand external pressures make them well-suited for underground and underwater applications. The construction industry also benefits from the use of LSAW pipes, especially in projects involving piling, structural support, and foundation works. The versatility of these pipes extends to various engineering applications, including the conveyance of chemicals and abrasive materials, further highlighting their adaptability across different industrial contexts. Overall, the broad spectrum of applications underscores the significance of LSAW pipes in ensuring the integrity and efficiency of diverse infrastructure projects."

Specification